Indoor television antenna



Sept. 16, 1952 JR. BROUGH 2,611,080

INDOOR TELEVISION ANTENNA Filed April 20, 1950 TELEVISION RECEIVER CHASSIS ANTENNA TERMINALS/ INVENTOR JAMES R. BROUGH ATTORNEY Patented Sept. 16, 1952 nvnooa TELEVISION'ANTENNA- James R. Brough, Alexandria, Va assignor to Melpar, Inc.,' Alexandria, Va. 7

Application April 20, 1950, Serial No. 157,137

2 Claims. (01. 250-16) or other radiant energy signals in the high and I ultra high frequency ranges.

Two separate windings are linked with the annular core. One of these windings is connected to the antenna terminals of a television receiver,

and is matched to the input impedance of the receiver. a tuning condenser, which serves to tune the en tire antenna system to resonance at the frequency of the signal it is desired to receive.

It is an object of the invention to provide a novel antenna system for use at high and ultra high frequencies.

It is another object of the invention to provide a novel antenna system for a radio receiver, which employs the power cord of the radio receiver as a structure for intercepting radiant energy.

It is still another object of the invention to 30 provide an antenna system for high and ultra high frequency signals which shall be more economical of fabrication than previously available antennae, and at the same time highly sensitive, and unobtrusive.

The above and still further features, objects and advantages of the present invention will become apparent upon consideration of the following detailed description of a specific embodiment thereof, especially when taken into conjunction with the accompanying drawing where- The single figure of the drawings is a view in perspective of astructure arranged in accordance with the invention.

Referring now more particularly to the drawings, the reference numeral I denotes the power cord which supplies commercial power from a ;power socket 2 to a television receiver chassis 3. Surrounding the cord 1 is annular core mem? ber 4, having a central aperture 5 through which the cord I extends, and which is fabricated of powdered iron, molded in plastic or other binding material, and which serves as a low reluctance core at the frequencies desired to be received, i. e.

The other winding is connected with at high and ultra high frequencies, or at the frequencies presently assigned for television broadcasting.

A winding 6 links with the core member 4, and is so designed as to have an impedance which matches the impedance at the input or antenna terminals 1 of the television receiver chassis 3. A further winding 8 links the core member 4, and is tunable by means of a variable condenser l connected in series therewith, and which serves thereby to tune the entire system, to any desired frequency.

The annular core member 4 may be provided with a small aperture 5, to provide close coupling of all the elements of the system, i. e. of the cord l, the windings 6 and 8, and the annular core 4. At the same time the size of the aperture 5 and of the core 4 is not critical, and the diameter of the core 4 may be from to 1%, for example.

The operation of the system may be conceived to be as follows. The cord l acts as a signal pick-up, and by reason of its connection to power lines, the latter also serve as a signal pick-up. There exists, therefore, on the cord l, electric currents at the frequency of the signal which it is desired to intercept and receive. This current gives rise to a magnetic field, which is localized or concentrated in the high frequency core member 4, inducing a voltage at the same frequency in winding 8. The latter is series tuned by condenser 9 to the desired frequency, so that current of considerable magnitude exists in winding 8, if the losses of the system are small. This current intensifies the magnetic field in the core member 4, and the latter field induces in winding 6 a relatively high voltage. which is applied to antenna terminals 1.

In order to provide high voltage in the winding 6, or at the terminals 1, it is desirable that the core member 4 be a low loss high permeability core, at the frequencies involved. Such cores are well known in the art, being generally fabricated of sintered iron, molded with suitable low loss binder, such as plastics capable of operation at high and ultra high frequencies, with low loss. Alternatively, carbonyl iron, in extremely small particles, may be molded directly with suitable plastic, to form the core.

While I have described and illustrated one specific embodiment of my invention, it will be clear that variants of the specific structure disclosed may be resorted to without departing from the true spirit and scope of the invention as defined in the appended claims.

What I claim and desire to secure by Letters Patent of the United States is:

1. For coupling to a power cord of a television receiver having antenna terminals, a core member of relatively high permeability low-loss magnetic material at high radio frequencies, said core having an aperture through which said cord may extend,.a. first-and a second winding lin king said core member, means for adjustably tuning said first winding to a desired frequency, said second winding having output terminals for con nection to said antenna terminals.

2. In combination with a power cord of an having relatively high permeability and low-loss 4 at said ultra high frequency, said core member surrounding said cord, a first and a second winding linking said core member, means for adjustably series tuning said first winding to said ultra high frequency, and means for connecting said second winding to said antenna terminals.

' JAMES R. BROUGH.

REFERENCES cr'rnn The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,982,690 Polydoroif Dec. 4, 1934 Gustafson Feb. 9, 1943 

